A reader can tell that the meaning of obnoxious will include having the quality of something because of the suffix -ous. That suffix is generally used for adjectives, so we know that it is used to show us a quality.
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The theme of the poem "Landscape with the Fall of Icarus" by William Carlos Williams is exactly that, the Fall of Icarus. This theme was explored many times throughout many major works, however here it is explored as a background image, not noticed by hardworking people in the sun. Icarus falls and drowns, and nobody bats an eye.